https://www.gia.edu/ametrine
Ametrine Gemstone | Natural Ametrine Stone - GIA
ametrine gemstonenaturalgia
https://geology.com/minerals/quartz/ametrine.shtml
Ametrine: A Bicolor Gemstone of Amethyst and Citrine
Ametrine is two gemstones in one. It combines the purple of amethyst and the golden color of citrine.
ametrinebicolorgemstoneamethystcitrine